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check all DNS, SPF, DKIM, deliverability issues (if applicable) Second Level After the first contact and after having been able to reproduce the problem, we

reach their intended recipients. First things first, let's talk about the importance of email authentication protocols like SPF, DKIM, and DMARC. These protocols

). Check SPF/DKIM alignment in your emailing software. 421 4.7.0 Soft IP Throttled (Rate Limit). Reduce sending volume; increase engagement. 554 5.7.1 Hard Content

. What to do: Authenticate emails with SPF, DKIM, and DMARC to improve inbox placement. Clean up your email list regularly to remove inactive subscribers and

, engagement signals matter more than gimmicks. 19) Authentication alignment check (SPF, DKIM, DMARC) Before sending at scale, confirm your sending domain is properly

Infrastructure The most important feature nobody puts on a feature list. Ask every vendor: Do you support SPF, DKIM, and DMARC authentication by default? What is your

when: The HTML code is messy, outdated, or improperly formatted Too many images are used with little to no text There’s a lack of email authentication (SPF, DKIM

urgency, multiple exclamation marks, aggressive phrasing) Authenticating your sending domain (SPF/DKIM/DMARC) Separating newsletters from transactional messages when

to enable advanced authentication methods, such as Domain Keys Identified Mail (DKIM) and Sender Policy Framework (SPF). By using these authentication methods

SMTP servers are fully suited to support large shipping volumes, and you can also enjoy high delivery capacity when installing SPF or DKIM for better delivery